Mesa (master): aco: fix nir_op_pack_32_2x16_split if one operand is a constant

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Module: Mesa
Branch: master
Commit: fc1068de0d124b746cc85b58564810c5453feee3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc1068de0d124b746cc85b58564810c5453feee3

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Sat Apr  4 10:07:51 2020 +0200

aco: fix nir_op_pack_32_2x16_split if one operand is a constant

Because 16-bit constants are represented with the s1 RegClass, we
have to extract the low half.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4509>

---

 src/amd/compiler/aco_instruction_selection.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/amd/compiler/aco_instruction_selection.cpp b/src/amd/compiler/aco_instruction_selection.cpp
index f713a761008..bc973a05e5a 100644
--- a/src/amd/compiler/aco_instruction_selection.cpp
+++ b/src/amd/compiler/aco_instruction_selection.cpp
@@ -2771,6 +2771,8 @@ void visit_alu_instr(isel_context *ctx, nir_alu_instr *instr)
       Temp src0 = get_alu_src(ctx, instr->src[0]);
       Temp src1 = get_alu_src(ctx, instr->src[1]);
       if (dst.regClass() == v1) {
+         src0 = emit_extract_vector(ctx, src0, 0, v2b);
+         src1 = emit_extract_vector(ctx, src1, 0, v2b);
          bld.pseudo(aco_opcode::p_create_vector, Definition(dst), src0, src1);
       } else {
          src0 = bld.sop2(aco_opcode::s_and_b32, bld.def(s1), bld.def(s1, scc), src0, Operand(0xFFFFu));